Can someone help me figure out amount of gallons?

We need the width of the stairs and the width of the slope. :)
*edit. Or either one to subtract to find the other
 
You need to specify the length of the slope, or the length of the deep end to do it correctly, and I don't know about stairs. Assuming the deep end is 14 and the slop is 10....

Shallow end (squared off)
(37-24) x 27 x 4 = 1,404

Shallow end (Inset)
(13-3-3) x 3 x 4 = 84

Slope (assumed 10')
((4+10) / 2) x 10 x 19 = 1,330

Deep end (assumed 14')
14 x 19 x 10 = 2,660

1,404 + 84 + 1,330 + 2,660 = 5,478 cu. ft.

5,478 x 7.48 = 40,975 gallons

That is making some assumptions obviously.
 
Plus subtract 6 inches from the whole thing to account for water height and not build height.

with the slope or deep end length we can get the rest.
 
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